Fix build of ProjectExplorer with g++ 4.8.2.
Fix build of ProjectExplorer with g++ 4.8.2.

The compiler is unable to match the arguments of the connect
statement when a QPointer is involved.

Change-Id: I87d3c11b9452f07739bf4e905a18071145c4e21d
Reviewed-by: hjk <f81b91af79013637d070c18d38a75b90eaae8ba3@nokiamail.com>

danimo/qt-creator,kuba1/qtcreator,amyvmiwei/qt-creator,AltarBeastiful/qt-creator,xianian/qt-creator,AltarBeastiful/qt-creator,xianian/qt-creator,Distrotech/qtcreator,AltarBeastiful/qt-creator,AltarBeastiful/qt-creator,farseerri/git_code,xianian/qt-creator,Distrotech/qtcreator,danimo/qt-creator,xianian/qt-creator,xianian/qt-creator,AltarBeastiful/qt-creator,amyvmiwei/qt-creator,danimo/qt-creator,Distrotech/qtcreator,amyvmiwei/qt-creator,kuba1/qtcreator,martyone/sailfish-qtcreator,kuba1/qtcreator,xianian/qt-creator,martyone/sailfish-qtcreator,AltarBeastiful/qt-creator,kuba1/qtcreator,amyvmiwei/qt-creator,danimo/qt-creator,kuba1/qtcreator,danimo/qt-creator,Distrotech/qtcreator,martyone/sailfish-qtcreator,danimo/qt-creator,AltarBeastiful/qt-creator,martyone/sailfish-qtcreator,danimo/qt-creator,martyone/sailfish-qtcreator,farseerri/git_code,farseerri/git_code,Distrotech/qtcreator,farseerri/git_code,martyone/sailfish-qtcreator,amyvmiwei/qt-creator,Distrotech/qtcreator,kuba1/qtcreator,amyvmiwei/qt-creator,Distrotech/qtcreator,amyvmiwei/qt-creator,farseerri/git_code,martyone/sailfish-qtcreator,danimo/qt-creator,kuba1/qtcreator,farseerri/git_code,xianian/qt-creator,xianian/qt-creator,farseerri/git_code,farseerri/git_code,AltarBeastiful/qt-creator,martyone/sailfish-qtcreator,martyone/sailfish-qtcreator,amyvmiwei/qt-creator,xianian/qt-creator,danimo/qt-creator,kuba1/qtcreator,kuba1/qtcreator